Hello !
I wonder if it is possible to design, build and optimize a speaker working only on one unit.
I mean, instead of working on a LR pair just work with mono signals (test signals and music tracks of course) on a single speaker.
Then when the result is convincing just make a copy of it and you get a stereo pair
The more that i think about it the more I feel the rightness of the approach.
If a speaker is good with a mono signal a pair with a stereo signal will be very good
What is stereo if not two monos ?
Anyway if you say that is a silly idea i trust you completely.

Then just one other questionThe TS parameters can be measured ?
Thanks and kind regards,
gino

No, not silly question at all.... Actually I design all of my speakers in "mono", and when I am satisfied with the result, I just "copy" it for a pair. The only problem might be to find music material that is not "too" stereo, so both channels sound close to each other, otherwise some instruments might sound too much attenuated, because they are recorded on the other channel. For your second question, here is a little calculator for measuring T-S parameters. What you need is an accurate sinevawe generator with adjustable output, an AC RMS multimeter, and a 10 ohm resistor for calibration. If you need further info how to use it, send me a PM. Well... as it turned out .exe files cannot be uploaded, so if you want it, I can send it to your E-mail.

Thank you !
i am regaining trust in myself
I tell you why this idea. Yesterday i listened from a little center alone music
I was surprised by the quality
I am pretty sure that two of those center would make a nice stereo pair indeed.

Quote:

Actually I design all of my speakers in "mono", and when I am satisfied with the result, I just "copy" it for a pair.
The only problem might be to find music material that is not "too" stereo, so both channels sound close to each other, otherwise some instruments might sound too much attenuated, because they are recorded on the other channel.

Thanks again. I am going to try for curiosity to get mono from stereo recordings that i have and like so much and in this way to create a library of mono music to use for some experiments with just one speaker.
I believe in the rightness of this approach.
As i believe that a symmetric speaker would be better
Symmetry is a quality of beauty ... i mean no L and R speakers.

Quote:

For your second question, here is a little calculator for measuring T-S parameters. What you need is an accurate sinevawe generator with adjustable output, an AC RMS multimeter, and a 10 ohm resistor for calibration. If you need further info how to use it, send me a PM. Well... as it turned out .exe files cannot be uploaded, so if you want it, I can send it to your E-mail.

Your reply answers completely my need. TS parameters can be measured.
For now it is a little complicated for me ... but i am studying.
Thank you very much again
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Some practical considerations.

1) Great stereo speakers require more extensive controlled directivity design considerations, as well as more room placement considerations for imaging, than a mono speaker. A great mono speaker design may not be a great stereo speaker.

2) It is not unusual for a speaker manufacturing process to drift, or even change, over time. The best chance of getting closely matched speaker pairs is to purchase them at the same time and add a note to your purchase order like "I would appreciate any small effort you can make to select speakers pairs with similar date codes or serial numbers."

3) Setting up the construction machines(saws, CNC, drills, etc..) takes brain-power, trial-and-error, and jigs. It is best to fabricate parts for two speakers at the same time.

4) Take advantage of well reviewed designs from generous experts. ADOPT....or....ADAPT to your goals.

Many exceptional professional designers design via crossover simulation programs and in box driver testing. A single unit verifies the adequacy of the crossover network and for tuning to voice the speaker. They may not even build/test a pair of speakers.

A stereo pair does little to aid the designer in design verification. The designer is more interested in meeting his goals for frequency/phase responses plus off axis performance vs. imaging. Once he is satisfied, two identical units will have the imaging and soundstage.

Designing in mono will not tell you anything about how well the speaker creates animage/soundstage. So even after getting the other bits right in mono, you may still not be done.

dave

If your speaker does not create a credible image/soundstage in mono (1pc.), it will NEVER do it in stereo. When my friends hear my "mono" designs in the process, they usually comment on the depth(!) of the soundstage it creates, and none of them is a newbie in the field.

A loudspeaker is a loudspeaker. All speakers are designed and measured as single units. If the layout is asymmetrical they are usually manufactured as symmetrical LR pairs.

But, if one wants to use a speaker strictly monophonic, then wide and constant radiation pattern must be superior. If well designed it will use the room as advantage in creating balanced power/room response and reflections.

If one wants to use speakers as stereo pais or in a multichannel system, narrow radiation pattern is preferred at least for front channels. Narrow pattern makes stereo imaging better because if reduces reflections (ratio between direct and radiated sound energy and delay of reflections are important parameters), simplistically said.

Naturally we have many opinions about the suitability and betterness of different systm approaches. Many listening tests and modern acoustic analysis/simulation support the general description I said above. Read Geddes, Olive, Toole et. al.

Before the era of stereophonics hifi speakers usually had several transducers pointing at different directions, also upwards. Often they were placed right next to the wall. They were called cabinet radios or systems. Most of them were integrated with radio and a record player.

Many exceptional professional designers design via crossover simulation programs and in box driver testing.
A single unit verifies the adequacy of the crossover network and for tuning to voice the speaker.
They may not even build/test a pair of speakers.
A stereo pair does little to aid the designer in design verification.
The designer is more interested in meeting his goals for frequency/phase responses plus off axis performance vs. imaging. Once he is satisfied, two identical units will have the imaging and soundstage

This is extremely interesting. Thank you for the information.
I understand that no driver is perfectly equal to another ... but it is always the case, we have tolerances.
The better the manufacturing the smaller the deviations.
Thanks a lot
Kind regards,
gino